OF DIPTEROUS LARVA. 3 
In the above description I have purposely refrained from enter- 
ing into very minute particulars, owing to the imperfection 
observable in my preserved specimens. I have ventured, however, 
to relate these few particulars, hoping at some future time to 
analyse more accurately fresh and living examples, should I have 
the good fortune to meet with them. 
I cannot conclude these remarks without expressing my thanks 
to my friend Dr. T. Spencer Cobbold for his excellent drawings, 
from which the accompanying figures have been copied. 


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Hil | 
DESCRIPTION OF CUT AS REDUCED. 
Fig. 1. Three larve (a, 5, c), of the natural size. 
Fig. 2. The specimen marked ce, X8 diameters. 
Fig. 3. Cephalic segment of the specimen (marked a) : a, buccal cavity ; 
b, cesophagus; c, pharyngeal teeth ; d, eyes; e, muscles of the mouth and 
pharynx ; f, muscles to the eyes; g, integument showing a double con- 
tour, X about 70 diameters. 
Feb. 21st, 1861. 
1* 
